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Later, looking over from a nearby hill, we could see the rebels in military fatigues walking in single file and stopping the people on the Congolese side from making the crossing.

Their flashlights swung left to right as around a dozen men walked single file across the hilltop.

Drone footage from the weekend showed long lines of men and boys standing or walking in single file.

Compared to cells moving in a single file, clusters were much slower.

They lined up single file against the brush, in a dusty clearing steps from Highway 94, and waited for Border Patrol agents to pick them up.